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Residential Whole Loans (Additional Credit Related Information) (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jun. 30, 2020 | Mar. 31, 2020 | Jun. 30, 2019 | Mar. 31, 2019 | Jun. 30, 2020 | Dec. 31, 2019
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |  |  |
2020 | $ 475,278 |  |  |  | $ 475,278 |
2019 | 2,293,936 |  |  |  | 2,293,936 |
2018 | 1,039,676 |  |  |  | 1,039,676 |
2017 | 115,203 |  |  |  | 115,203 |
2016 | 14,905 |  |  |  | 14,905 |
Prior | 874,121 |  |  |  | 874,121 |
Residential whole loans, at carrying value, total or weighted average | 4,813,119 |  |  |  | 4,813,119 |
Gross write-offs, 2018 |  |  |  |  | 816 |
Gross write-offs, prior |  |  |  |  | 426 |
Net write-offs, 2018 |  |  |  |  | 816 |
Net write-offs, 2018 |  |  |  |  | 426 |
Six Months Ended June 30, 2020 Gross write-offs | 627 | $ 647 | $ 50 | $ 0 | 1,274 |
Total Recoveries |  |  |  |  | 0 |
Six Months Ended June 30, 2020 Net write-offs |  |  |  |  | 1,274 |
Purchased Performing Loans | 4,086,606 |  |  |  | $ 4,086,606 | $ 5,370,653
Ratio Loan-To-Value |  |  |  |  | 80.00% |
Debt-to-Value Ratio, Less than 80 Percent |  |  |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |  |  |
2020 | 441,656 |  |  |  | $ 441,656 |
2019 | 2,220,700 |  |  |  | 2,220,700 |
2018 | 1,006,151 |  |  |  | 1,006,151 |
2017 | 103,797 |  |  |  | 103,797 |
2016 | 11,278 |  |  |  | 11,278 |
Prior | 576,468 |  |  |  | 576,468 |
Residential whole loans, at carrying value, total or weighted average | 4,360,050 |  |  |  | 4,360,050 |
Debt-to-Value Ratio, 80 to 100 Percent |  |  |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |  |  |
2020 | 33,622 |  |  |  | 33,622 |
2019 | 73,236 |  |  |  | 73,236 |
2018 | 33,525 |  |  |  | 33,525 |
2017 | 11,406 |  |  |  | 11,406 |
2016 | 3,627 |  |  |  | 3,627 |
Prior | 297,653 |  |  |  | 297,653 |
Residential whole loans, at carrying value, total or weighted average | 453,069 |  |  |  | 453,069 |
Non-QM Loans |  |  |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |  |  |
2020 | 403,761 |  |  |  | 403,761 |
2019 | 1,305,594 |  |  |  | 1,305,594 |
2018 | 766,133 |  |  |  | 766,133 |
2017 | 90,825 |  |  |  | 90,825 |
2016 | 7,871 |  |  |  | 7,871 |
Prior | 0 |  |  |  | 0 |
Residential whole loans, at carrying value, total or weighted average | 2,574,184 |  |  |  | 2,574,184 |
Purchased Performing Loans | 2,574,184 |  |  |  | 2,574,184 | 3,707,245
Non-QM Loans | Debt-to-Value Ratio, Less than 80 Percent |  |  |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |  |  |
2020 | 375,156 |  |  |  | 375,156 |
2019 | 1,265,076 |  |  |  | 1,265,076 |
2018 | 733,368 |  |  |  | 733,368 |
2017 | 81,119 |  |  |  | 81,119 |
2016 | 7,718 |  |  |  | 7,718 |
Prior | 0 |  |  |  | 0 |
Residential whole loans, at carrying value, total or weighted average | 2,462,437 |  |  |  | 2,462,437 |
Non-QM Loans | Debt-to-Value Ratio, 80 to 100 Percent |  |  |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |  |  |
2020 | 28,605 |  |  |  | 28,605 |
2019 | 40,518 |  |  |  | 40,518 |
2018 | 32,765 |  |  |  | 32,765 |
2017 | 9,706 |  |  |  | 9,706 |
2016 | 153 |  |  |  | 153 |
Prior | 0 |  |  |  | 0 |
Residential whole loans, at carrying value, total or weighted average | 111,747 |  |  |  | 111,747 |
Rehabilitation loans |  |  |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |  |  |
2020 | 47,361 |  |  |  | 47,361 |
2019 | 676,368 |  |  |  | 676,368 |
2018 | 129,325 |  |  |  | 129,325 |
2017 | 9,841 |  |  |  | 9,841 |
2016 | 0 |  |  |  | 0 |
Prior | 0 |  |  |  | 0 |
Residential whole loans, at carrying value, total or weighted average | 862,895 |  |  |  | 862,895 |
Gross write-offs, 2018 |  |  |  |  | 816 |
Gross write-offs, prior |  |  |  |  | 0 |
Net write-offs, 2018 |  |  |  |  | 816 |
Net write-offs, 2018 |  |  |  |  | 0 |
Six Months Ended June 30, 2020 Gross write-offs |  |  |  |  | 848 |
Six Months Ended June 30, 2020 Net write-offs |  |  |  |  | 848 |
Purchased Performing Loans | 862,895 |  |  |  | 862,895 | 1,026,097
Rehabilitation loans | Debt-to-Value Ratio, Less than 80 Percent |  |  |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |  |  |
2020 | 43,735 |  |  |  | 43,735 |
2019 | 659,139 |  |  |  | 659,139 |
2018 | 128,777 |  |  |  | 128,777 |
2017 | 8,141 |  |  |  | 8,141 |
2016 | 0 |  |  |  | 0 |
Prior | 0 |  |  |  | 0 |
Residential whole loans, at carrying value, total or weighted average | 839,792 |  |  |  | 839,792 |
Rehabilitation loans | Debt-to-Value Ratio, 80 to 100 Percent |  |  |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |  |  |
2020 | 3,626 |  |  |  | 3,626 |
2019 | 17,229 |  |  |  | 17,229 |
2018 | 548 |  |  |  | 548 |
2017 | 1,700 |  |  |  | 1,700 |
2016 | 0 |  |  |  | 0 |
Prior | 0 |  |  |  | 0 |
Residential whole loans, at carrying value, total or weighted average | 23,103 |  |  |  | 23,103 |
Single-family rental loans |  |  |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |  |  |
2020 | 24,156 |  |  |  | 24,156 |
2019 | 311,974 |  |  |  | 311,974 |
2018 | 144,218 |  |  |  | 144,218 |
2017 | 13,900 |  |  |  | 13,900 |
2016 | 0 |  |  |  | 0 |
Prior | 0 |  |  |  | 0 |
Residential whole loans, at carrying value, total or weighted average | 494,248 |  |  |  | 494,248 |
Purchased Performing Loans | 494,248 |  |  |  | 494,248 | 460,742
Single-family rental loans | Debt-to-Value Ratio, Less than 80 Percent |  |  |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |  |  |
2020 | 22,765 |  |  |  | 22,765 |
2019 | 296,485 |  |  |  | 296,485 |
2018 | 144,006 |  |  |  | 144,006 |
2017 | 13,900 |  |  |  | 13,900 |
2016 | 0 |  |  |  | 0 |
Prior | 0 |  |  |  | 0 |
Residential whole loans, at carrying value, total or weighted average | 477,156 |  |  |  | 477,156 |
Single-family rental loans | Debt-to-Value Ratio, 80 to 100 Percent |  |  |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |  |  |
2020 | 1,391 |  |  |  | 1,391 |
2019 | 15,489 |  |  |  | 15,489 |
2018 | 212 |  |  |  | 212 |
2017 | 0 |  |  |  | 0 |
2016 | 0 |  |  |  | 0 |
Prior | 0 |  |  |  | 0 |
Residential whole loans, at carrying value, total or weighted average | 17,092 |  |  |  | 17,092 |
Seasoned performing loans |  |  |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |  |  |
2020 | 0 |  |  |  | 0 |
2019 | 0 |  |  |  | 0 |
2018 | 0 |  |  |  | 0 |
2017 | 0 |  |  |  | 0 |
2016 | 80 |  |  |  | 80 |
Prior | 155,199 |  |  |  | 155,199 |
Residential whole loans, at carrying value, total or weighted average | 155,279 |  |  |  | 155,279 |
Purchased Performing Loans | 155,279 |  |  |  | 155,279 | 176,569
Seasoned performing loans | Debt-to-Value Ratio, Less than 80 Percent |  |  |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |  |  |
2020 | 0 |  |  |  | 0 |
2019 | 0 |  |  |  | 0 |
2018 | 0 |  |  |  | 0 |
2017 | 0 |  |  |  | 0 |
2016 | 80 |  |  |  | 80 |
Prior | 147,302 |  |  |  | 147,302 |
Residential whole loans, at carrying value, total or weighted average | 147,382 |  |  |  | 147,382 |
Seasoned performing loans | Debt-to-Value Ratio, 80 to 100 Percent |  |  |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |  |  |
2020 | 0 |  |  |  | 0 |
2019 | 0 |  |  |  | 0 |
2018 | 0 |  |  |  | 0 |
2017 | 0 |  |  |  | 0 |
2016 | 0 |  |  |  | 0 |
Prior | 7,897 |  |  |  | 7,897 |
Residential whole loans, at carrying value, total or weighted average | 7,897 |  |  |  | 7,897 |
Purchased Credit Deteriorated Loans |  |  |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |  |  |
2020 | 0 |  |  |  | 0 |
2019 | 0 |  |  |  | 0 |
2018 | 0 |  |  |  | 0 |
2017 | 637 |  |  |  | 637 |
2016 | 6,954 |  |  |  | 6,954 |
Prior | 718,922 |  |  |  | 718,922 |
Residential whole loans, at carrying value, total or weighted average | 726,513 |  |  |  | 726,513 |
Gross write-offs, prior |  |  |  |  | 426 |
Net write-offs, 2018 |  |  |  |  | 426 |
Six Months Ended June 30, 2020 Gross write-offs |  |  |  |  | 426 |
Total Recoveries |  |  |  |  | 0 |
Six Months Ended June 30, 2020 Net write-offs |  |  |  |  | 426 |
Purchased Credit Deteriorated Loans | Debt-to-Value Ratio, Less than 80 Percent |  |  |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |  |  |
2020 | 0 |  |  |  | 0 |
2019 | 0 |  |  |  | 0 |
2018 | 0 |  |  |  | 0 |
2017 | 637 |  |  |  | 637 |
2016 | 3,480 |  |  |  | 3,480 |
Prior | 429,166 |  |  |  | 429,166 |
Residential whole loans, at carrying value, total or weighted average | 433,283 |  |  |  | 433,283 |
Purchased Credit Deteriorated Loans | Debt-to-Value Ratio, 80 to 100 Percent |  |  |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |  |  |
2020 | 0 |  |  |  | 0 |
2019 | 0 |  |  |  | 0 |
2018 | 0 |  |  |  | 0 |
2017 | 0 |  |  |  | 0 |
2016 | 3,474 |  |  |  | 3,474 |
Prior | 289,756 |  |  |  | 289,756 |
Residential whole loans, at carrying value, total or weighted average | 293,230 |  |  |  | 293,230 |
Settled Whole Loans |  |  |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |  |  |
Residential whole loans, at carrying value, total or weighted average | 4,676,530 |  |  |  | 4,676,530 | 6,066,345
Settled Whole Loans | Non-QM Loans |  |  |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |  |  |
Purchased Performing Loans | 2,542,831 |  |  |  | $ 2,542,831 | $ 3,706,857
Ratio Loan-To-Value |  |  |  |  | 64.00% | 67.00%
Settled Whole Loans | Rehabilitation loans |  |  |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |  |  |
Purchased Performing Loans | 832,895 |  |  |  | $ 832,895 | $ 1,023,766
Ratio Loan-To-Value |  |  |  |  | 63.00% | 64.00%
Settled Whole Loans | Single-family rental loans |  |  |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |  |  |
Purchased Performing Loans | 487,317 |  |  |  | $ 487,317 | $ 460,679
Ratio Loan-To-Value |  |  |  |  | 70.00% | 70.00%
Settled Whole Loans | Seasoned performing loans |  |  |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |  |  |
Purchased Performing Loans | 155,055 |  |  |  | $ 155,055 | $ 176,569
Ratio Loan-To-Value |  |  |  |  | 42.00% | 46.00%
Settled Whole Loans | Certain Rehabilitation Loans |  |  |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |  |  |
Purchased Performing Loans | $ 280,600 |  |  |  | $ 280,600 | $ 269,200
Ratio Loan-To-Value |  |  |  |  | 68.00% | 69.00%

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